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IP Telephony Configuration Guide
Chapter 2
Prerequisites checklist
Before you set up VoIP trunks or IP telephones on a Business Communications Manager,
complete the following checklists to ensure that the system is correctly set up. Some questions do
not apply to all installations.
Network diagram
To aid in installation, a Network Diagram is needed to provide a basic understanding of how the
network is configured. Before you install IP functionality, you must have a network diagram that
captures all of the information described in Table 1. If you are configuring IP telephones but not
voice over IP (VoIP) trunks, you do not need to answer 1.d and 1.e.
Table 1 Network diagram prerequisites
Network devices
Table 2 contains questions about devices on the network such as firewalls, NAT devices, and
DHCP servers.
• If the network uses public IP addresses, complete 2.b.
• If the network uses private IP addresses, complete 2.c to 2.d.
Table 2 Network device checklist
Prerequisites Yes
1.a Has a network diagram been developed?
1.b Does the network diagram contain any routers, switches or bridges with corresponding
IP addresses and bandwidth values for WAN or LAN links?
1.c Does the network diagram contain IP Addresses, netmasks, and network locations of all Business
Communications Managers?
1.d Answer this if your system will use IP trunks, otherwise, leave it blank: Does the network diagram
contain IP Addresses and netmasks of any other VoIP gateways that you need to connect to?
1.e Answer this only if your system will use a gatekeeper, otherwise, leave it blank: Does the network
diagram contain the IP address for any Gatekeeper that may be used?
Prerequisites Yes No
2.a Is the network using private IP addresses?
2.b Are there enough public IP addresses to accommodate all IP telephones and the Business
Communications Manager?
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